Docker Compose

What’s in it for you?
1. What is Docker?
2. What is a Docker Compose?
3. Benefits of Docker compose
4. Docker Compose vs Docker Swarm
5. Basic commands of Docker
6. Demo
Let’s get started
Docker Compose

What is Docker?
Docker is a tool which is used by developer and operation teams to create and automate the deployment of
applications in lightweight containers so that applications can work efficiently in different environments
Docker Engine
Host OS
Infrastructure
App A
Bins/Libs
App C
Bins/Libs
Docker Container
1
App B
Bins/Libs
Docker Container
2
Docker Container
3

What is Docker?
Docker Engine
Host OS
Infrastructure
App A
Bins/Libs
App C
Bins/Libs
Docker Container
1
App B
Bins/Libs
Docker Container
2
Docker Container
3
Note
Container is a software
package that consists of
all the dependencies
required to run an
application
Docker is a tool which is used by developer and operation teams to create and automate the deployment of
applications in lightweight containers so that applications can work efficiently in different environments

What is Docker?
• First, Docker image is build using a Docker file
• A Docker Image contains all the project’s code, whereas a Dockerfile is a text file which contains commands for
building a Docker Image
How are Docker containers created ?
Docker File
Docker Image

What is Docker?
• With Docker Image, an individual can run the project code in order to create Docker Containers
• Also, when a Docker Image is built, it’s uploaded by a user in the Docker Hub
How are Docker containers created ?
Docker File
Docker Container
Docker Image Docker Hub

What is Docker?
How are Docker containers created ?
Docker File
Docker Container
Docker Image Docker Hub
Container
Container
• From the Docker Hub, users can pull any Docker Image and build new containers

What is Docker?
How are Docker containers created ?
Docker File
Docker Container
Docker Image Docker Hub
• From the Docker Hub, users can pull any Docker Image and build new containers
Container
Container
What if a user wants to use two
containers in a single service?

Docker Compose
Suppose, you have more than one Container in
Docker (like , a webserver and a database running
in separate containers) building, running, and connecting the containers from separate Dockerfiles is difficult and can take a lot of time

Docker Compose
Suppose, in Docker you have more than one
Container (like , a webserver and database
running in separate containers) building, running,
and connecting the containers from separate
Dockerfiles is difficult and can take a lot of time

Docker Compose
Suppose, in Docker you have more than one
Container (like , a webserver and database
running in separate containers) building, running,
and connecting the containers from separate
Dockerfiles is difficult and can take a lot of time
But with Docker Compose, It is
possible to easily run more than one
container in a single service

Docker Compose
Suppose, in Docker you have more than one
Container (like , a webserver and database
running in separate containers) building, running,
and connecting the containers from separate
Dockerfiles is difficult and can take a lot of time
Using Docker Compose, It is easily
possible to run more than one
container in a single service
But what is Docker Compose?

Consider an example of Myntra, where
What is Docker Compose?

Product
catalogue
(server)
Cart
(server)
Checkout
(server)
What is Docker Compose?
Login
account
(server)
Consider an example of Myntra, where

Product
catalogue
(server)
Cart
(server)
Checkout
(server)
Product (DB) Cart
(DB)
What is Docker Compose?
Login
account
(server)
Accounts
(DB)
Checkout
(DB)
Consider an example of Myntra, where

Product
catalogue
(server)
Cart
(server)
Checkout
(server)
Product (DB) Cart
(DB)
What is Docker Compose?
This is a micro service
Login
account
(server)
Accounts
(DB)
Checkout
(DB)
Consider an example of Myntra, where

Product
catalogue
(server)
Login
account
(server)
Cart
(server)
Checkout
(server)
Accounts
(DB)
Product (DB) Cart
(DB)
Checkout
(DB)
What is Docker Compose?
Suppose more products are
added, this microservice can
be scaled easily without
making any changes to the
other microservices
Consider an example of Myntra, where

We can relate the example of Myntra to
Docker, where Docker Compose can connect different containers
(server and DB) as a single service
What is Docker Compose?
Server
DB
Server
DB
Server
DB
Server
DB

What is Docker Compose?
• Docker Compose is used for running multiple containers as a single service
{Docker
Compose
Single
service
Container
Container

What is Docker Compose?
• Docker Compose is used for running multiple containers as a single service
• Here, containers run in isolation but can interact with each other
Container
Container

What is Docker Compose?
• Docker Compose is used for running multiple containers as a single service
• Here, containers run in isolation but can interact with each other
• All Docker Compose files are YAML files
Container
Container
Docker
Compose file

What is Docker Compose?
• Docker Compose is used for running multiple containers as a single service
• Here, containers run in isolation but can interact with each other
• All Docker Compose files are YAML files
• In Docker Compose, a user can start all the services (containers) using a single command
Container
Container
Docker
Compose fileDocker Compose up
Command
=

What is Docker Compose?
For example:
If you have an application which requires NGINX server and Redis database, you could create one Docker
Compose file which can run both containers as a service without the need to start each one separately
Container 1
Container 2

What is Docker Compose?
For example:
If you have an application which requires NGINX server and Redis database, you can create a Docker Compose
file which can run both the containers as a service without the need to start each one separately
Docker file
Docker file
Docker Compose
(YAML file)
Single
service
Container 1
Container 2

Benefits of Docker Compose
Single host
deployment

Benefits of Docker Compose
Quick and easy
configuration
Single host
deployment

Benefits of Docker Compose
High productivityQuick and easy
configuration
Single host
deployment

Benefits of Docker Compose
Security
Single host
deployment
High productivityQuick and easy
configuration

Docker Compose
Wait a minute! I guess
Docker Compose is quite similar to
Docker Swarm?

Docker Compose
Wait a minute! I guess
Docker Compose is quite similar to
Docker Swarm!
No, it’s not! Let me show you the
difference

Docker Compose vs Docker swarm
 It creates multiple containers on a
single host
Docker Compose Docker Swarm

Docker Compose vs Docker swarm
 It creates multiple containers on a
single host
 It creates multiple containers on multiple hosts
Docker Compose Docker Swarm

Docker Compose vs Docker swarm
 It creates multiple containers on a
single host
 It uses YAML file to manage different
containers as a single service
 It creates multiple containers on multiple hosts
Docker Compose Docker Swarm

Docker Compose vs Docker swarm
 It creates multiple containers on a
single host
 It uses YAML file to manage different
containers as a single service
 It creates multiple containers on multiple hosts
 It doesn’t use any file but helps you to manage
different Docker hosts in a cluster
Docker Compose Docker Swarm

Basic commands of Docker compose
Start all servuices with a command:
Docker Compose up
Start all servuices with a command:
Docker Compose down
Command to install Docker Compose
using pip:
pip install -U Docker-compose
Command to check the version of Docker
Compose:
Docker-compose-v
Command to run Docker Compose file
Docker-compose up -d
Command to list down all the process
Docker ps
Command to scale a service
Docker Compose up –d --scale
Command to use YAML files to configure
application services
Docker Compose.yml